Terrifying robot watch update: in the video above, a Defense Advanced Research Projects Agency (DARPA) robot called "Pet-Proto" is locked in a corridor and presented with two obstacles. The first is a step it must climb onto. The second is a gap it must inch across.

It's like a video game tutorial. Only instead of learning how to move an avatar, it's learning how to get around obstacles so it can complete its mission to eradicate humanity.